General Information

GStreamer is a "library for constructing graphs of media-handling components", it is used for shadowing existing displays.
This shadowing is read-only.
GStreamer is also used for sound forwarding.

Features

GStreamer screen shadowing (aka screencasting) offers the following options:

• Framerate: from 1 to 50 fps
• Scaling methods: offering better a trade-off between high CPU usage and lower quality
• Screen size scaling

Here is what the dialog looks like:

Plugins Used

GStreamer screen shadowing relies on the following plugins for capturing, sending and receiving the video stream:

• ximagesrc for screen capture
• videoscale
• gdp for payload
• tcp for transport
• queue for buffering

The following compression plugins are supported:

• theora: Theora Video
• VP8
• xvid
• divx (no documentation available)

GStreamer then displays the stream on the receiver using one of those plugins:

• autovideosink automatically detected
• xvimagesink for Unix-like operating systems that support XVideo
• glimagesink using OpenGL
• sdlvideosink using SDL
• ximagesink for standard X11 displays